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SocSci 9C 2007 Test 1

# SocSci 9C 2007 Test 1 - NAME TEST PROBABILITY AND...

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NAME: _______________________________ I.D.: _________________________________ TEST PROBABILITY AND STATISTICS APRIL 13, 2007 1-2 (Two questions – Twenty points) There are two variables, shoe size (X) and neck size (Y). What is the correlation coefficient? The standard deviations of X and Y are 6 and 5. X Y 3 18 7 14 15 26 15 20 3. Let’s continue with the above example. You are testing to see if the result is significant. Let it be a two-tailed test where α = .05. What is the critical value? What do you conclude concerning the null hypothesis, and what does this mean with regards to what you can conclude about the relation between shoe size and neck size? (You must discuss these two variables.) 4-5. (Two questions – Twenty points) Let’s have some fun calculating lambda. Please do so for the below data. 30 40 10 70 10 5 5 10 20 6. Fill in the below chart with numbers that make Spearman’s rho and Gamma equal. 7-8. (Two questions – twenty points) Let’s calculate Somers’ d for the below data. 3 4 0 3 2 1 2 1 1

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9. There is a correlation table for order horses (who’s in first, second, third place, etc.) at various points in a race (¼ mile, ½ mile. ¾
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SocSci 9C 2007 Test 1 - NAME TEST PROBABILITY AND...

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